For the uninitiated, a very elaborate joke: (unique) integers as a service:

http://brooklynintegers.com/about/

That's pretty good. They are now my second favorite integer-related joke site. Almost, but not quite good enough to displace the prime-shitting bear: http://alpha61.com/primenumbershittingbear/

f'ing brilliant. And actually a usefully gentle introduction to API construction and use.